Efficient separation of various valuable metals in acid mine drainage
The recovery and utilization of valuable metals from acid mine drainage(AMD)was a crucial method for reducing heavy metal emissions and treatment costs.In this study,we investigated the optimal precipitation and adsorption pH for the recovery of valuable metals through neutralization precipitation experiments and static adsorption experiments.We successfully developed a combined process of neutralization precipitation-ion exchange-neutralization precipitation to treat Dabaoshan AMD.The results indicated that neutralization precipitation at pH 3.00 and 9.80 produced iron-enriched slag with 64%Fe2O3 and manganese-enriched slag with 51%MnO,respectively.Furthermore,Cu and Zn in AMD were adsorbed by an ion exchange resin at pH 3.95 and 6.10,respectively,yielding two desorption solutions with mass concentrations of Cu2+11-26 g/L and Zn2+10-20 g/L.The recovery ratios were 96%,81%,70%,and 60%for Fe,Cu,Zn,and Mn,respectively,demonstrating efficient separation and recovery of valuable metals.The recovery of copper,zinc,and manganese sulfate from 2,000 m3/d of AMD in Dabaoshan could yield an annual profit of 1.19 million yuan,signifying a substantial economic benefit.This treatment process presented a novel and effective approach for the recovery and utilization of valuable metals from AMD.
acid mine wastewatercopperzincmetal recoveryion exchange resinwaste water treatment
万方数据
维普
